US4349939A - Automatic door closer - Google Patents

Automatic door closer Download PDF

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Publication number
US4349939A
US4349939A US06/157,814 US15781480A US4349939A US 4349939 A US4349939 A US 4349939A US 15781480 A US15781480 A US 15781480A US 4349939 A US4349939 A US 4349939A
Authority
US
United States
Prior art keywords
door
piston
housing
pressure
closer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/157,814
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English (en)
Inventor
Horst Tillmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dorma Baubeschlag GmbH and Co KG
Original Assignee
Dorma Baubeschlag GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dorma Baubeschlag GmbH and Co KG filed Critical Dorma Baubeschlag GmbH and Co KG
Assigned to DORMA-BAUBESCHLAG GMBH & CO. KG. reassignment DORMA-BAUBESCHLAG GMBH & CO. KG. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TILLMANN, HORST
Application granted granted Critical
Publication of US4349939A publication Critical patent/US4349939A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
    • E05F3/04—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes
    • E05F3/10—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes with a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction
    • E05F3/104—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices with liquid piston brakes with a spring, other than a torsion spring, and a piston, the axes of which are the same or lie in the same direction with cam-and-slide transmission between driving shaft and piston within the closer housing
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F3/00—Closers or openers with braking devices, e.g. checks; Construction of pneumatic or liquid braking devices
    • E05F3/22—Additional arrangements for closers, e.g. for holding the wing in opened or other position
    • E05F3/225—Additional arrangements for closers, e.g. for holding the wing in opened or other position mounted at the bottom of wings, e.g. details related to seals, covers, connections to the wings, embedding in the floor
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13—Type of wing
    • E05Y2900/132—Doors

Definitions

  • the invention relates to an automatic door closer with a closing shaft, which can be coupled with the wing of a door so that it may be pivoted from a closed position in both directions of rotation, and which, within the housing positively grips with a lift cam disc between the rolls of a longitudinally moveable slide, which is acted upon by a spring arrangement which forms an energy storage and by the piston of a hydraulic damping device, whereby the inner space of the housing of the door closer is divided by the piston into two separate pressure-medium spaces, which can be connected with one another by channels for the differently throttleable discharge of the pressure medium from the pressure space, which becomes smaller as the door closes, and by a safety valve, which is arranged in the piston and which opens up as excess pressure developes during the closing motion of the wing of the door.
  • the door closer also as a door arrester because, with the channels closed by the throttling device, the pressure medium cannot flow away from the pressure space between the piston and the threaded plug by the action of the return spring alone if the control valve is so adjusted that the pressure in the pressure space, produced by the return spring, is not sufficient for opening the control valve. Only when the force of the return spring is supported by a brief exertion of a closing force on the wing of the door (e.g. a push) and a pressure of sufficient magnitude is produced in the pressure space so that the control valve opens, can the pressure medium flow from the pressure space in front of the piston into the pressure-medium space holding the closing spring.
  • a closing force on the wing of the door e.g. a push
  • the stepped valve seat of the latter is smaller than the cross section of the valve body, so that, once the valve body had been lifted from the valve seat, it remains in its open position. Moreover, by using a blocking element activated by the piston, the cylinder bore in the housing of the door closer can remain free from junctions with the throttling channels, so that, by using sealing sleeves with the piston so as to seal the pressure space from the pressure-medium space, no leaks can develop as a result of the increased wear of the seal between the piston and its cylinder wall.
  • both channels discharge, according to a characteristic refinement of the invention, in a central, stepped bore, open to the pressure space, of a threaded plug which closes off the pressure space, a force-loaded, sleeve-shaped, stepped blocking element being arranged in the stepped bore.
  • the return-flow velocity in the range of door-opening angles from 80° to 180° may be different from that in the range of door-opening angles from 0° to 80° and, on the other, the range of door openings, in which the wing of the door may be arrested, can be selected, the throttleable channels discharge offset to each other in relation to the longitudinal direction of the door closer into the stepped bore of the threaded plug and are separated by a distance, which corresponds to the traverse of the piston for a door-opening angle of 80° and to which the length of the blocking section--of equal diameter--of the control slide valve, which is guided in the stepped bore so as to close it off, is adjusted.
  • the control valve is preferably integrated in the channel which discharges the pressure medium in the range of door opening angles from ca. 80° to the closed position.
  • the throttling valve connected to the channel corresponding to the range of door-opening angles from 0° to 80°, is opened so that, with an open control valve, a return flow of the pressure medium from the pressure space into the pressure-medium space holding the spring arrangement is possible.
  • the force of the spring pressing on the valve body of the control valve is so adjusted, that the closing force of this control valve is less than the closing force of the safety valve mounted in the piston.
  • the blocking element has, according to a further refinement of the invention a control section adjoining its blocking section and the front face of the control section can be acted upon from the base of the piston, which is connected with the slide, during a segment of the traverse of the piston.
  • the reversal operation of the blocking element to close one channel and to open the other preferably takes place at a door opening angle of approximately 80°.
  • FIG. 1 shows an automatic, floor door closer in a vertical section along the line I--I of FIG. 2 in a position of the closing mechanism corresponding to the closed position of the door.
  • FIG. 2 shows the floor door closer, represented in FIG. 1, in a plan view in section along the line II--II of FIG. 1.
  • FIG. 3 shows a plan view, corresponding to FIG. 2, in which the closing mechanism however has taken up a position corresponding to a 90° opening of the door.
  • the floor door closer on which the embodiment is based, is intended for example for a swinging door and has a housing 10, which is to be filled with a pressure medium, such as oil for example.
  • a closer shaft 11 is mounted in the housing 10 in such a manner that it can rotate.
  • the closer shaft 11 has a noncylindrical socket 12, in which a pin (not shown) of the required length is fixed and with which the door can be connected.
  • the door is shown in part in dash-dot lines in FIG. 1 with the bottom face of the door closely adjacent to the top face of the door closer.
  • the closer shaft 11 is supported rotatably at its upper end by means of a bearing 13 in a ring bearing 14 which can be bolted to the housing 10 and at its lower end by means of a bearing 15 in the housing 10.
  • the closer shaft 11 is sealed in the ring bearing 14 by means of a gasket.
  • the closer shaft has a lifting cam disc 17.
  • the same comprises two regions, which are symmetrical about a central plane.
  • the cam curve is characterized by a zone 18, which provides for the closed position, and moreover by two gradually rising zones 19 and 20, as well as by a more steeply rising zone 21.
  • Longitudinal regions 22 and 23 of the closer shaft, which are adjacent the cam disc 17 pass through parallel guide slots 24 in plates 25.
  • the guide slots 24 are connected together to form a slide with a clear spacing which exceeds the thickness of the cam disc 17.
  • Two pins 26 are used for the connection, whose end portions engage the plates 25, while their central longitudinal regions respectively rotatably hold rolls 27 and 28.
  • the rolls 27 and 28 interact with the traverse cam plate 17, that the latter lies between them with little play in every conceivable position of rotation.
  • a rod 30 is connected for example by rivets 29 with the slide formed by plates 25.
  • the rod 30 passes through a compression spring 31 which acts as a energy storage.
  • the compression spring 31 is in contact with a piston 33, which is connected with the rod 30 by means of a gudgeon pin 32 and the piston can be displaced in a cylinder bore 34 of housing 10 so as to seal it.
  • the end of spring 31, facing the closer shaft 11, is in contact with the stop 35 formed in housing 10.
  • the cylinder bore 34 is closed off by a threaded plug 36.
  • a check valve 39 with a spring-loaded closing member is mounted in such a manner, that the channel bore 37 is open when the piston moves to the left and closed when the piston moves to the right.
  • the traverse path of the closing element is limited by stops.
  • a sleeve-shaped, stepped blocking element 42 which is displaceably mounted in a stepped bore 41 of the threaded plug 36, ends in this pressure space 40.
  • This blocking element has a blocking section 43 of an axial length corresponding to the stroke of the piston 33 when the door moves to an opening angle of about 80°.
  • the blocking section 43 is guided in a leakproof manner in a subsection of the stepped bore 41 of equal diameter and is subjected to a force in the direction of the pressure space 40 by a compression spring 44.
  • the blocking section 43 of the blocking element 42 is adjacent to the control section 45, which passes through the section of the stepped bore 41 having a smaller diameter into the pressure space 40 in such a manner that an annular clearance remains between the stepped bore 41 ending in the pressure space 40 and the control section 45.
  • a seal is arranged on the control section in the region of the adjoining blocking section 43. As shown in FIG. 3, this seal seals the annular clearance between the stepped bore 41 and the control section 45 when the blocking element 42 is pushed out.
  • a radial bore 46 is arranged in the threaded plug 36. This radial bore ends in a recess in the housing 10, which corresponds to the outside diameter of the thread of the plug.
  • This recess is connected via a channel section 47 with a channel section 48 running in the longitudinal direction of the housing 10.
  • Channel section 48 ends via a cross bore 49 in the pressure-medium space 50, which holds the compression spring 31.
  • a throttling device 51 with which the flow in the channel, formed by the radial bore 46, the channel sections 47 and 48 and the cross bore 49, can be throttled as well as blocked completely.
  • a further radial bore 46' which is offset in the longitudinal direction of the housing 10 with respect to the radial bore 46 for a distance equal to the axial length of the blocking section 43, and which ends in a ring channel of the threaded plug 36, passes through the threaded plug 36.
  • a channel section 47' connects with this ring channel.
  • This channel section 47' ends in a further channel section 48', which runs in the longitudinal direction of the housing 10 and is, in turn, connected with a cross bore 49', which leads into the pressure-medium space 50.
  • a throttling device 52 with which the flow in the channel, formed by the radial bore 46', the channel section 47' and 58' and the cross bore 49' can be throttled or blocked completely.
  • a safety valve 53 is mounted in the base 38 of the piston. This safety valve 53 is kept closed by the pressure of a spring and is opened, to allow the pressure medium in the pressure space 40 to flow into the pressure medium space 50, only when the piston 33 is moved towards the right as a result of an increase in pressure in the pressure space 40.
  • a control valve 54 is connected in the radial bore 46'. This control valve 54 is screwed into the threaded plug 36 perpendicularly to the radial bore 46' and can connect the radial bore 46' with the pressure space 40, when the valve body 55 is pressed back against the force of the valve compression spring 56.
  • the slide which is formed by plates 25, lies with roll 27 against region 18 of the curve of the cam disc 17, in conformity with the initial tension on spring 31.
  • the roll 27 abuts thereby at two points, mutually offset on the circumference of the cam disc 17, so that its position of rotation and therefore the closed position of a swinging door are clearly determined.
  • the cam disc 17 turns relative to roll 27 and, as a result of the slope of the cam curve 19, the slide 25 is displaced towards the left. Thereby spring 31 of piston 33 is compressed further via rod 30.
  • the pressure medium in pressure space 40 will, as the wing of the door is let go, reach the bore of the sleeve-shaped blocking element 42 via the slot in the collar of the safety valve 53 and from there flow back into the pressure-medium space 50 of housing 10 via the channel formed by the radial bore 46, the channel sections 47 and 48 as well as the cross bore 49 and past the throttling device 51.
  • the closing velocity can be determined by adjusting the throttling device 51.
  • the piston 33 is moved towards the right by the compression spring 31, whereby the blocking element 42 is also pushed by the piston 33 towards the right.
  • blocking section 43 of the blocking element moves over radial bore 46, blocking it.
  • the seal of the blocking element 42 mounted at the bearing shoulder between the blocking section 43 and the control section 45, releases the radial bore 46', which occurs at a door-opening angle of about 80°.
  • the pressure medium flows via channels 46' to 49' past the throttling device 52 back into the pressure-medium space 50, while channels 46 to 49 remain blocked until the door reaches its totally closed position.
  • the closing motion of the wing of the door can be damped more or less also in the range of opening angles between 80° and 0°.
  • the wing of the door may be arrested in any open position. As described previously, it is possible to open the wing of the door via the cam disc 17, the slide 25, the rod 30 connected to the slide and the piston 33 linked to the rod, by withdrawing the piston 33 against the force of the compression spring 31 and so enlarging the pressure space 40, while at the same time the pressure medium in pressure-medium space 50 of housing 10 can reach the pressure space 40 via the opened check valve 39.
  • the compression spring 31 acts in a closing sense on piston 33, whereby a pressure is built up in the pressure space 40 and closes the check valve 39. Because throttling devices 51 and 52 are also closed, the pressure medium cannot flow from the pressure space 40 into the pressure-medium space 50 via either of the channels 46 to 49 or 46' to 49', depending on the position of the blocking element 42. Consequently, the wing of the door remains in the open position attained.
  • valve body 55 which is constructed as a stepped piston, from its valve seat against the force of the valve compression spring 56, so that the pressure, produced by the compression spring 31, now acts on the whole of the piston surface of the valve body 55, holding it in its open position, and the pressure medium is returned from the pressure space 40 via the control valve 54 into the pressure-medium space 50 by means of the force of the compression spring 31 alone.
  • the compression of the valve compression spring 56 of the control valve 54 moreover is set somewhat lower than that of the spring of the safety valve 53. Consequently, the pressure medium, appropriately damped, reaches the pressure medium space 50 through control valve 54 into the radial bore 46' of channel 46' to 49' and past the open throttling device 52.
  • control slide 42 takes up a position shown in FIG. 3, until the collar of the safety valve 53 has reached the front face of control section 45 at the displaceable blocking element 42 and has now pushed this back further, so that the pressure medium can now also reach the radial bore 46' of channel 46' to 49' through the annular clearance between the front region of the stepped bore 41 and the control section 45 of the blocking element 42.
  • the closing motion of the wing of the door then also continues during the last 80° of the door-opening angle, automatically damped, as a result of the action of compression spring 31 alone. In this case however, the wing of the door can be arrested only in the range of door opening angles above 80°. In the range of door-opening angles between 0° and 80°, the wing of the door returns damped to its closed position immediately after being let go.
  • both throttling devices 51 and 52 are open, the wing of the door returns to its closed position from any open position in the usual manner with a damped velocity.
  • the throttling devices 51 and 52 may be opened to a different extent, so that the wing of the door can return in two steps at different speeds to its closed position.

Landscapes

  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
US06/157,814 1979-06-15 1980-06-09 Automatic door closer Expired - Lifetime US4349939A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792924311 DE2924311A1 (de) 1979-06-15 1979-06-15 Selbsttaetiger tuerschliesser
DE2924311 1979-06-15

Publications (1)

Publication Number Publication Date
US4349939A true US4349939A (en) 1982-09-21

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ID=6073355

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/157,814 Expired - Lifetime US4349939A (en) 1979-06-15 1980-06-09 Automatic door closer

Country Status (6)

Country Link
US (1) US4349939A (ja)
JP (1) JPS563777A (ja)
DE (1) DE2924311A1 (ja)
FR (1) FR2459348A1 (ja)
GB (1) GB2052622B (ja)
IT (1) IT1130789B (ja)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455708A (en) * 1981-06-23 1984-06-26 Paumellerie Electrique Door closer having a braking mechanism comprising an elastomeric bag
US4793023A (en) * 1987-06-15 1988-12-27 Yale Security Inc. Door closer and holder
US4999872A (en) * 1987-12-12 1991-03-19 Dorma Gmbh & Co. Kg Door closer
WO1996026343A1 (de) * 1995-02-22 1996-08-29 Dorma Gmbh + Co. Kg Türschliesser
US6442795B1 (en) * 2001-01-16 2002-09-03 Girefa Enterprise Co., Ltd. Damper for a pivot door
US20030093872A1 (en) * 2001-10-10 2003-05-22 Jebron Limited Door closer
US20040034964A1 (en) * 2002-08-20 2004-02-26 Jorg Loggen Drive for a movable element
US20060021189A1 (en) * 2004-07-30 2006-02-02 Johnson Loring M Door closer
US20060117525A1 (en) * 2004-12-08 2006-06-08 Harri Juntunen Valve
US20090093913A1 (en) * 2007-04-24 2009-04-09 Copeland Ii David James Door closer assembly
US20100287729A1 (en) * 2009-05-15 2010-11-18 Zheijang Moer Hardware Mfg Co., Ltd. Hydraulic Door Closer
US8109038B2 (en) 2004-06-30 2012-02-07 Yale Security Inc. Door operator
US20120117755A1 (en) * 2009-07-24 2012-05-17 Dorma Gmbh + Co. Kg Door Closer
US20120117758A1 (en) * 2009-07-24 2012-05-17 Dorma Gmbh + Co. Kg Hinged Door with Hinge Plate
US8225458B1 (en) 2001-07-13 2012-07-24 Hoffberg Steven M Intelligent door restraint
US20120272475A1 (en) * 2009-12-01 2012-11-01 Dorma Gmbh + Co. Kg Door Closer Comprising Additional Closing Spring
US8415902B2 (en) 2010-04-16 2013-04-09 Yale Security Inc. Door closer with calibration mode
CN103233640A (zh) * 2013-04-18 2013-08-07 赵泳淇 内置地弹簧
US8527101B2 (en) 2010-04-16 2013-09-03 Yale Security Inc. Door closer assembly
US8547046B2 (en) 2010-04-16 2013-10-01 Yale Security Inc. Door closer with self-powered control unit
US8564235B2 (en) 2010-04-16 2013-10-22 Yale Security Inc. Self-adjusting door closer
US8773237B2 (en) 2010-04-16 2014-07-08 Yale Security Inc. Door closer with teach mode
US8779713B2 (en) 2010-04-16 2014-07-15 Yale Security Inc. Door closer with dynamically adjustable latch region parameters
US20150128379A1 (en) * 2013-11-13 2015-05-14 Dorma Deutschland Gmbh Overhead door closer
US9163446B2 (en) 2010-03-17 2015-10-20 Yale Security Inc. Door control apparatus
US20160177610A1 (en) * 2014-12-17 2016-06-23 Dorma Deutschland Gmbh Door operator
ITUA20162264A1 (it) * 2016-04-04 2017-10-04 Savio Spa Dispositivo a cerniera per porte, ante o similari
US10995533B2 (en) * 2018-06-25 2021-05-04 Geze Gmbh Hydraulic drive for a door sash or window sash

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DE3001406A1 (de) * 1980-01-16 1981-07-23 Dorma-Baubeschlag Gmbh & Co Kg, 5828 Ennepetal Selbsttaetiger tuerschliesser
GB2158148B (en) * 1984-04-27 1988-03-02 Jebron Ltd Door closer
DE8524727U1 (de) * 1985-08-16 1986-12-18 Gretsch-Unitas GmbH Baubeschläge, 7257 Ditzingen Türschließer
GB2224310A (en) * 1988-10-04 1990-05-02 Maurice George Dixon Self-closing door time control
DE9308568U1 (de) * 1993-06-09 1994-01-13 Dorma Gmbh + Co. Kg, 58256 Ennepetal Einbautürschließer mit Gleitschienengestänge für den verdeckten Einbau in Türblättern oder Türrahmen
US5417013A (en) * 1992-07-10 1995-05-23 Dorma Gmbh + Co. Kg Overhead door closer with slide rail for concealed installation in door panels or door frames
US5523473A (en) * 1992-12-30 1996-06-04 Nippon Shokubai Co., Ltd. Method of producing naphthalenedicarboxylic acids and diaryldicarboxylic acids
GB9420349D0 (en) * 1994-10-10 1994-11-23 Hawkins David F Connector
DE20112896U1 (de) * 2001-08-03 2002-12-05 Società Italiana Progetti S.r.l., Magenta, Mailand/Milano Selbsttätiger Türschließer
GB2441893B (en) * 2004-06-17 2008-10-15 Astra Door Controls Ltd Damped door closer comprising spring, piston and piston valve mechanism with spring seal member
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JP7097795B2 (ja) * 2018-11-08 2022-07-08 リョービ株式会社 フロアヒンジ
USD954467S1 (en) 2019-10-22 2022-06-14 Vertilux Limited Side channel
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GB425241A (en) * 1933-09-28 1935-03-11 James Sidney Adams Improvements in and connected with door checks
US3137888A (en) * 1962-01-11 1964-06-23 Bommer Spring Hinge Co Inc Concealed overhead door closer
US3246362A (en) * 1962-01-22 1966-04-19 Jackson Exit Device Corp Door closer
US3584331A (en) * 1969-06-13 1971-06-15 Rixson Inc Hydraulic door checking mechanism
DE2030443A1 (de) * 1970-06-20 1971-12-30 Vereinigte Baubeschlagfabriken Gretsch & Co Gmbh, 7250 Leonberg Türschliesser mit Dämpfvorrichtung
FR2311918A1 (fr) * 1975-05-20 1976-12-17 Pont A Mousson Ferme-porte a amortissement hydraulique
US4064589A (en) * 1976-03-18 1977-12-27 Builders Brass Works Door closer

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455708A (en) * 1981-06-23 1984-06-26 Paumellerie Electrique Door closer having a braking mechanism comprising an elastomeric bag
US4793023A (en) * 1987-06-15 1988-12-27 Yale Security Inc. Door closer and holder
AU618211B2 (en) * 1987-06-15 1991-12-12 Yale Security Inc. Door closer and holder
US4999872A (en) * 1987-12-12 1991-03-19 Dorma Gmbh & Co. Kg Door closer
WO1996026343A1 (de) * 1995-02-22 1996-08-29 Dorma Gmbh + Co. Kg Türschliesser
US6442795B1 (en) * 2001-01-16 2002-09-03 Girefa Enterprise Co., Ltd. Damper for a pivot door
US8225458B1 (en) 2001-07-13 2012-07-24 Hoffberg Steven M Intelligent door restraint
US9995076B1 (en) 2001-07-13 2018-06-12 Steven M. Hoffberg Intelligent door restraint
US9121217B1 (en) 2001-07-13 2015-09-01 Steven M. Hoffberg Intelligent door restraint
US9045927B1 (en) 2001-07-13 2015-06-02 Steven M. Hoffberg Intelligent door restraint
US11187022B1 (en) 2001-07-13 2021-11-30 Steven M. Hoffberg Intelligent door restraint
US20030093872A1 (en) * 2001-10-10 2003-05-22 Jebron Limited Door closer
US7003847B2 (en) * 2001-10-11 2006-02-28 Jebron Limited Door closer
US20040034964A1 (en) * 2002-08-20 2004-02-26 Jorg Loggen Drive for a movable element
US8499495B2 (en) 2004-06-30 2013-08-06 Yale Security Inc. Door operator
US8109038B2 (en) 2004-06-30 2012-02-07 Yale Security Inc. Door operator
US20060021189A1 (en) * 2004-07-30 2006-02-02 Johnson Loring M Door closer
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Also Published As

Publication number Publication date
IT8022804A0 (it) 1980-06-13
DE2924311C2 (ja) 1991-10-02
JPS563777A (en) 1981-01-16
GB2052622A (en) 1981-01-28
FR2459348B1 (ja) 1984-02-17
GB2052622B (en) 1983-04-07
DE2924311A1 (de) 1980-12-18
IT1130789B (it) 1986-06-18
FR2459348A1 (fr) 1981-01-09

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